You need to do some work before you burden a raid with that hunter.
You should at most have 1 or 2 greens (Im talking Trinkets or rings, not major gear pieces) before you raid Kara.
Yes I have seen less geared people worm their way into a raid only to be carried the whole time, so either put some effort in on improving yourself or find some well geared friends to hand you epics.
If you want to see what you are ready for in the Raiding World, I suggest checking out
Be Imba!